Sometimes an actual count is too difficult, for example, at a rally. Furthermore, an estimate meets the requirements.
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An overestimate is when you estimate something, like the number of people in a stadium. Then you find out what the actual number is, and it is less than your estimate. I estimate there are 100,000 people in the stadium. Then it's announced that there are 97,235 in attendance. So I overestimated.
An actual measurement is going to be more accurate than an estimate.
Estimate where actual budgetary outlay could be + or - 75%
2 times 17 is 34 divided by (7 - 2) which is 5, so let's call it 35 over 5 and the estimate is 7. The actual is 7.68, so we're close enough.
Actual/365 is the day-count convention used for US Treasury bonds.